Molding-press.



N0.731,498. y Y PATBNTED JAN-.311905. 4 o. H. DARLING L H. RHEAD.

2 SHEETS-SHEET 2.

Cyarl@ MOLDING PRESS.

v y APPLIUATION FILED un. 22, 1904.

Armfm I f CHARLES HENRY DARLINGV yLING. and HARRY RHEAD, citizens of the United UNITED STATES Patented January 31, 1905.

PATENT OFFICE.

AND HARRY RHEAD', or TRENToN, NEvv c. JERSEY. 1

MioLDiNG-PRESS. A

SPEGIFIlCATIONformng part of lLetters Patent No. 781,498, dated January 31,

Appiicauon flied Aprii 22, 190A. sei-iai No. 204,391. 'l

.'lo all whom t may concern:

Beit known that we, CHARLES HENRY DAR- States, and residents of Trenton, in the county of Mercer and State of New Jersey, have invented a new and Improved Molding-Press, Vof

which the following is a full, clear, and'eiact description. i y f Our invention relates to a molding-press capable of use Yfor molding all plastic substances, but especially'applicable-for the manufacture of tiles from clay.

The-object of our invention is'to provide a ipower-operated molding-press with means whereby the operations ordinarily performed in hand-presses may take place automatically ,and without the intervention of any manual control. The manner of attaining this object which we prefer to employ and which Aconstitutes the principle of our invention will ,be further described, and the subsidiary objects will be' disclosed yin the subjoined description. r

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters ofy reference indicate corresponding parts in all the figures.

Figure 1 is a side view of a preferred- 4form of our invention. Fig. 2 is an endview of the same. v Fig. 3 is a diagrammatic View illustrating the operation of the cams. Fig. 21 ,y

isa central sectional view onY the line 114 ofFig; 2. Fig. 5 is a Vcentral sectional yview on 'the line 5 5 of Fig. 1; Fig. 6 isa plan'` view of the feed-box and attachments, and Fig. 7vis a centralsectional View showing the manner of iilling the mold. f

In thev particular embodiment of our invention which is represented in the drawings the numeral' 11 represents a base provided with standards 12, which support a mold-plate, The

part of a mold. Although throughout this each Ycomplete mold is formed byia perforation and the plungers 14 and 15, which enter its opposite ends. TheseV two series of plungers are attachedto and supported by a pair ofv plunger-plates 16 and 17 18 is a-feed-boX adapted tonioveacross the top of the mold and suppy it with' plastic materialto be molded.

1t will be obvious from the description so far given that the material to be molded is intended to be placed in the feed-box 18, passed over theA top of the molds, and discharged therein and that the feed-box must then be Withdrawn in order to permit the plunger la position suiiicient'ly long .tohold the molded article o in position for the front `part of the feed-box 18 to engage with it and push it along out of the way, as'shown in Fig. 7 Mechanism foroperating th'eseparts will n ow be described. v f Y 19 isa slide to v'which is attached the plungerplate 16 and which is provided at its upper e`nd witlia roller 20, adaptedto be ioperated by means ofy aca'ni21, fixed to a'shaft 22.l

.The shaft-'2 2 is mounted in bearings o'f ordinary or any desired. construction, whichk are adapted to be adjusted verticallyby means of nuts. 23 on thestandards`12. This adjustment, as will be seenfrom the drawings, will Aserve to lfully regulate the distance between the plungers 14 and 15 when they are in the nearest position With-respect to eachother in the mold. The shaft 221may be operated by any desired means, that shown consisting of a gear 211, meshing with a worm-25, which is operated from a pulley 26 by means of a belt of the ordinary kind. AThe slide 19 is guided with respect to the standards 12 by means of guides 27. 28 is a second cam fixed to the shaft 22 and controlling the operation of a roller 29, journaled in the upper end of a vertically-reciprocating rod 30, which is adjustable by means of a nut 31 and is pivoted at its lower end to a lever 32, which in turn is pivoted to the standard at the point 33 and carries at its lower end a roller 34. rlhis roller is adapted to engage with and operate a plateV 35, attached to rods 36, and normally pressed downwardly by means of springs 37. The base 11 is perforated at 38 for the purpose of permitting the rods 36 to pass through it and for guiding the-same. 39 is a third earn fixed to the shaft 22 and is preferably constructed in the form of a groove on each side of the cam 21. v

40 is a roller or pin attached to the end of a lever 41, which is pivoted at 42 to a bracket 43, mounted upon one of the guides 27. The lower end of the lever 41 is pivoted to a link 44, which is adjustable, as shown at 45, for the purpose of increasing or decreasing its length and is adaptedl to engage with the. feed-box 18 and reciprocate it on the plate 46, which is attached to the mold-plate 13. The plate 46 has guides 47 at each side for the feed-box. The rear end of the feed-box is provided with a projection 48, which, as shown in Fig. 7, is designed to close the bottom of the feed-hopper 49 when the feed-box is projected away from it.

50 represents the upper part of the hopper, which is preferably provided with a slot for the purpose of permitting the lever 41 to pass through it.

51 and 51a represent a pair of wiping-rollers which are journaled upon the frame at the front part of the feed-box 18 and to which are secured at the ends a pair of pinions or small gears 52 and 52a. The upper part of the guide 47 upon one side is provided with a rack 53, with which the pinion 52 engages. The pinion 52 also engaging with the pinion 52l1 it will be obvious that upon the reciprocation of the feed-box along the guides 47 the two rollers 51 and 51 will be caused to rotate upon their axes. 54 is another pinion, also engaging with the rack 53 and mounted upon the end of a shaft carrying an agitator or mixing device 55, located in the feed-box 18. The reciprocation of the feed-box will also obviously rotate the agitating device.

56 represents a device of any desired character for the purpose of dropping oil or other lubricant upon the roller 51, which will in turn apply it to the roller 51. The purpose of this arrangement is to cause the rollers to act not only as wiping devices, but as oiling devices for the plungers. The base 11 is provided with springs 57 forthe purpose of taking any extra strain from th'e standards l2 which would occur if any hard substance should get into the molds between the plungers.

58 is a pivoted lever with one end attached to the upper part of the slide 19 and provided with an adjustable weight 59 for the purpose of keeping the slide 19 in a raised position ex- .cept when operated upon by the cam 21.

The details of our invention as represented in the drawings having been described, the operation of the device will now be explained.

Referring' to Fig. 3, it will be seen that when the shaft 22 is in such a position that the cams will take the position shown in that {igure the moving parts of the machine will be substantially in the positions shown in Fig. 5 and the rollers 20, 29, and 40 will be as indicated in Fig. 3. Upon thel rotation of the shaft in the direction of the arrow, the iirst effect will be to force the roller 20 downwardly until the point is reached, the effect of this motion being to force the plunger 14 downwardly into the mold nearly as far as it is necessary for it to go in order to compress the material therein. During this time the roller 29 and the roller 40, being upon the circular parts of their respective cams, will remain stationary, and the plunger 15 and feed-box 18 will also remain stationary. From the point to the point c the roller 20 will be allowed to be pulled upwardly to a slight extent by the weight 59 and the roller 29 will be forced downwardly by a projection (Z on the cam 28. The effect of this operation will be to force the air to escape from the partly-compressed mass of plastic material, which is an object attained in hand-presses by manual manipulation. The roller 40 will still remain upon the circular part of its cam, and therefore the feedbox 18 will notmove during this period. rlhe shape of the two cams 21 and 28 between the points and c is such as to bring both rollers 20 and 29 back to their original positions, so that they are in the same place at the points Z1 and c. Accordingly the plungers 14 and 15, which have both been raised, but in different degrees and on different curves, will be brought back to their original positions. Upon the rotation of the shaft from the point c to the point e the roller 2O will be forced farther downward, taking with it the plunger 14, and the roller 29 will remain stationary, as will the plunger 15, the obvious effect of which will be to compress the material between the plungers to the extent desired. At this point the compression of the material in the mold is completed, and the further operation of the cams is for the purpose of removing said material from the mold and placing the plungers in position for receiving a new charge. rlhe cani 28 may be circular between c and c, if desired, the plunger l5 being stationary. From the pointe to the point f the roller 29 will be forced farther down on aecount of the shape of the cam at this point, and it is to be undeastood that the cani-surface from f to /L is sufficiently high not only lOO IIO

to lforce the plunger to the top of the mold, but to project its upper surface a small distance-for example, asi'Xteenth of an inchabove the top of the guide-plate 46. Previous to this the 'cam-surface e to g upon the cam 2l is of such a character as to have permittedl the weight 59 to pull the plunger 14 entirely out of the mold. The remainder of the surface of the'cam 21 from the point g tothe point m and around to the point ois perfectly circular, sothat the plunger 14 remains at the top of its stroke during'all this period. When the shaft is rotated 'tothe point/1., the roller' 29 -is permitted to be forced'toward the center ofv the shaft a short distance, preferably the same distance that the plunger 15 projects v above 'the top of the plate 46, allowing for the mold or to its original position, which it re'-l leverage of the connections between the cam andv plunger'. When the cam 28 reaches the point Z, the roller 29 drops tothe point m and depresses the plunger 15 to the bottom of the tains until the shaft again rotates to the point b. After theV shaft passes the point/c the camgrooves 39 are of such shape as to force the roller 40 outwardly from the Center,'and consequently force the feed-box toward the mold,

and when the' shaft reaches the point n the l will be caused to rotate and insure the depo- ,sition of the plastic material' into the mold when the feed-box reaches its innermost position. The operat-ion of the plungers and feedboX is such that the top of the plunger 15 will be even with the top of the plate 46 when the feed-box is projected over it, and as the plunger is withdrawn while the feed-box is in that position and while it is receding the material `will not drop into the mold, and thereby entrap air, but will be sucked into the mold even if it is not forced in vby gravity or by the operation of the agitating Vdevice 55. This is' a very important poirll, because it prevents the introduction of a large amount of air, which is always present in certainv other forms ofmolding-machines.'

1t is to be observed that the cam-grooves 39 .are set. at abou-t ninety degrees from the cams 2 1 and-28 on account of the roller 40 being placed at voneside of the cam instead of at the bottom, where the rollers l2O and 29` are located. It will be obvious that the camsmay be set 1in any desired position and that'the exact shape vthereof maybe departed from in many particulars without changing our invention, also that many other modifications may be made without departing from the spirit thereof.

Having thus described o ur invention, we claim as new and desire to secure by Letters Patent- 1. A molding-press comprising a mold, two plungers, one of said plungers adapted to enter the mold from each end, means for forcingl one plunger-into the mold, means for thereafter slightly retracting said plunger While it remains in the mold, means'for simultaneously moving the other plunger forward. in the mold, means for then forcing said plungers back toward the opposite ends of the mold, and means for finally withdrawing said j first-mentioned plunger.

2. Amolding-press comprising a mold, a plunger adapted to enter the mold from above, a plunger adapted to enter the mold from bellow, means for forcing the upper plunger into the mold to compress the plastic material,

. means for slightly retracting the upper plunger while it remains in the mold for permitting air to escape from the plastic material,

means for simultaneously moving the lower plunger upwardly, means for then forcing saidupper plunger back toward vthe lower plunger to complete the compression of the material, and means for finally withdrawing said upper plunger.

' 3. A molding-press comprising a mold, two plungers, one of said plungers adapted to enter the mold from each end, means `for forc- King one plunger into the mold, means for` slightly retracting said plunger inthe mold, means for simultaneously moving the second plunger forward slightly in the mold, means` for then simultaneously moving both plungers 1n reverse dlrections, means for withdrawing one plunger from the mold,and means for simultaneously moving the other plunger through the mold and'beyond the opposite face thereof. 4. A molding-press comprising amold, an

upper plunger and a lower plunger, means for forcing the upper plunger into the mold,

means for slightly'raising said plunger in the mold, means for slightly raising the lower plunger in the mold, means for then simultaneously lowering both plungers, rmeans for withdrawing the upper plunger, and means for simultaneously raising the lower plunger to a lpoint above the upper face of themold. 5. A molding-press comprising a mold, a plunger adaptedto enter the mold, means for holding'said'plunger temporarily ina sta- IOO IIO

tionary position, means for then moving'said plunger slightly in the mold, means for retracting said plunger, and means for finally upper end thereof beyond the upper face of the mold.

7. A molding-press comprising a mold, a pair of plungers, a main shaft, two cams on said shaft, and connections from said cams to said plungers for simultaneously forcing one plunger into the mold and holding the other stationary, and then simultaneously slightly retracting the first plunger and forcing the other one toward it.

8. A molding-press, comprising a mold, two plungers coacting therewith, a shaft, a cam on the shaft, and connections from said cam to said plungers for forcing one of the plungers into the mold, then simultaneously retracting said plunger and forcing the other one toward it, then forcing the first-mentioned plunger back, and finally withdrawing it from the mold.

9. A molding-press comprising a mold, two plungers coacting therewith, a shaft, two cams on said shaft, and connections from said cams to said shaft for simultaneously forcing one plunger down into the mold, slightly retracting it, forcing it downward again. and finally withdrawing it and holding the other plunger stationary, raising it, lowering it, and finally raising it to the top of the mold.

10. A molding-press comprising a mold, a plunger adapted to enter the bottom thereof, a cam, an adjustable rod operatively connected to said cam, and connections from said rod to said plunger for forcing the plunger upwardly in the mold, retracting it, and finally forcing it through the mold .to the upper end thereof.

11. A molding-press comprising a mold, a plunger adapted to enter the mold, a cam, a rod operatively connected to said cam and reciprocable thereby, a lever pivoted to said rod, a plunger-plate supporting said plunger, and a resilient connection between said lever and said plunger-plate.

12. A molding-press comprising a mold, a pair of plungers, a feed-box, an agitator in said feed-box, means for reciprocating said plungers, means for reciprocating said feedbox, and means for transmitting motion from said feed-box to said agitator to rotate said agitator.

13. A molding-press comprising a mold, a plunger, a feed-box, wiping-rollers, means for reciprocating said plunger, means for reciprocating said feed-box, and means for rotating said rollers.

14. A molding-press comprising a mold, a pair of plungers, a feed-box, a pair of rollers mounted upon said feed-box, means for reciprocating said feed-box, means for rotatingsaid rollers, and means for holding` said plungers in position to be touched by the surfaces of said rollers in their reciprocation.

15. In a molding-press, the combination of a mold, a movable plunger therefor, means for withdrawing the plunger from the mold, a rotary wiper, means for moving the wiper across the face of the plunger, and means for simultaneously rotating the wiper.

16. Ina molding-press, the combination of a mold, aplurality of plungers therefor, means for withdrawing one of the plungers from the mold, means for moving the other plunger through lthe mold and beyond the face thereof, a pair of rotary wipers, means for moving the wipers across the faces of said two plungers, and means for simultaneously rotating the wipers.

17. In a molding-press, the combination of a mold, a movable plunger therefor, a feedbox for plastic material, means for withdrawing the plunger from the mold, means for moving the feed-box over the face of the mold, a rotary wiper mounted upon the feed-box, and means for rotating the wiper.

18. In a molding-press, the combination of a mold, a pair of plungers therefor, a cam for withdrawing one of the plnngers from the mold, a cam for forcing' the other plunger through the mold and beyond the face thereof and for holding said plungers in these positions, a pair of rotary wipers, means for moving the wipers across the faces of the pl ungers, a stationary rack, and a gear secured to one of said wi pers and meshing with said rack.

19. In a molding-press, the combination of a mold, a feed-hopper, a feed-box, means for moving the feed-box across the face of the mold, and a rotary agitating device in said feed-box adapted to be rotated by the movement of the feed-box.

20. In a molding-press, the combination of a mold, a feed-hopper, a feed-box, means for moving said feed-box across the face of the mold, an agitating device mounted in said feed-box, a stationary rack. and a gear fixed to said agitating device and meshing with said rack.

21. In a molding-press, the combination of a mold, a plunger therefor` a rotary wiper, means for moving the wiper across the face of the plunger, means for simultaneously rotating the wiper, and means for supplying oil to the wiper.

22. In a molding-press, the combination of a mold, a pair of plungers therefor, means for IOS IIO

withdrawing one of said plungers from the mold, means for forcingthe other plunger Y through the mold and beyond the face thereof, a pair of rotary wipers, means for moving said Wipers across the faces of said plungers, means for slmultaneously rotating said wlpers, and means for supplying 011 to said wipers,

whereby the wipers supply the surfaces of the plungers with oil.

'In testimony whereof we have signed our I0 names to this specification in the presence of two subscribing witnesses.

CHARLES HENRY DARLING. HARRY RHEAD. Witnesses:

ELLERY ROBRINS', EDWARD R. RORBINS. 

